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Narrow tube
Hex wrench
CLOSE OPEN
Wide tube
Outdoor
unit
Wide tube
132 ft.
Narrow tube
Max. allowable
tubing length
at shipment
Required
additional
charge
Indoor
unit
Fig. 50
Fig. 51
Charging additional refrigerant
●
Calculate the required amount of additional refrigerant
according to narrow tube length (see P. 3, Table 3).
(Fig. 50)
●
Use a balance (scale) to measure the refrigerant accu-
rately.
●
After the required vacuum level is reached, charge liquid
refrigerant from the charge opening of the liquid-side
valve. Valves must be closed at this time.
Note: If the additional refrigerant charge amount cannot all
be charged at once, charge the remaining refrigerant
in gas form by using the wide tube service valve with
the system in Cooling mode at the time of test run.
●
When the charging is completed, all valves must be fully
opened.
Finishing the job
(1) With a hex wrench, turn the narrow tube service valve
stem counter-clockwise to fully open the valve. (Fig. 51)
(2) With a screwdriver, turn the wide tube service valve
stem counter-clockwise to fully open the valve. (Fig. 51)
(3) Loosen the charge hose connected to the wide tube
service port (1/4".) slightly to release the pressure,
then remove the hose.
(4) Replace the 1/4". flare nut and its bonnet on the wide
tube service port and fasten the flare nut securely with an
adjustable wrench or box wrench. This process is very
important to prevent gas from leaking from the system.
(5) Replace the valve caps at both wide and narrow ser-
vice valves and fasten them securely.
This completes air purging with a vacuum pump. The air
conditioner is now ready for a test run.
CAUTION
Use a charging cylinder
designed for use with R410A.
CAUTION
When charging R410A, due to the
high pressure be sure to careful-
ly open the charging cylinder
valve a little at a time.
CAUTION
To avoid gas from leaking when
removing the charge hose, make
sure the stem of the wide tube is
turned all the way out (“BACK
SEAT” position).